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(See: "Filtering Viruses Through the Cloud").
Since then, Trend Micro pioneered a so-called "cloud-based" anti-virus system that keeps much of the work of filtering viruses in far away data centers.
The company claims it's also 300 times better at filtering bacteria, 500 times better at filtering allergens, and 800 times better at filtering viruses.
Following filtering, viruses are subsampled to achieve a more equitable temporal and geographic distribution.
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The filters, which can remove arsenic from water and recycle water from urine on the International Space Station, will soon be available to filter viruses out of water lines in dental equipment, the company's vice president, Cindi Prorok, said.
"One reason operators keep giving me for switching off encryption is, operators want to be able to monitor traffic, to detect and suppress Skype, or to filter viruses, in a decentralized fashion," Mr. Nohl said.
For seawater, 10 L was filtered, viruses were absorbed to a filter (type HA negatively charged membrane with a 0.45-μm pore size, Nihon Millipore, Tokyo, Japan) and eluted in 40 mL alkali buffer, and 40 mL buffer was further concentrated by ultracentrifugation to give a final volume of 500 μL (6 ).
These type of devices contain a pore size of less than 0.5 microns to filter viruses and bacteria.
The medium was replaced 6 24 h after transfection and, 72 h after transfection, filtered virus supernatant was concentrated ~20× by ultracentrifugation (Beckman SW28 rotor, 25 000 rpm, 1 h, 4 °C).
Spin-infection was carried out on the following 2 days with filtered virus supernatant, in the presence of 7 µg/ml Polybrene at 1800 rpm, 90 min, 32°C.
Filtered virus containing medium was used for cell infection.
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